Note: "A shorter and substantially different version of this work was published as The Plague From Space (c) 1965."

New York: Tor, July 1982, 280pp., ISBN: 0-523-48540-9, pbk. Cover: Tom Kidd. Reprinted March 1987 (ISBN: 0-8125-3975-3, Cover: Tom Kidd).

Moscow: (Eksmo), 1998, 512pp., ISBN: 5-04-001219-5. [Russian]